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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fecd999713d1be1938578d0267e59d5b41ad8aa76ba090a686e7f019514753d4' 
  AND token = 'Er2S6uC4PLcAmpHfca82I3ZIP4ieEw9qVfc0AXVwtB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}